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A barn that smells sharp by 8 a.m., shows wet bedding before noon, or leaves animals crowding openings by late afternoon already has a ventilation problem. Livestock ventilation requirements are not just about moving air. They are about controlling heat, moisture, ammonia, airborne pathogens, and temperature swings without creating harmful drafts or wasting power. That is where many projects go sideways. Owners often start with fan diameter or price, when the real question is how much air exchan …